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Forget strategies like necrowagon if u wanna get good in ud.

Ghouls works like zergling in sc in begging of the game. If u wanna rush maybe u should double crypt no graveyard and push after lvling dk fast to lvl 2. But never ghoul rush orc, it just wont cut it. Human it can work, but you gotta have good micro. Best vs ne or ud.

The key to gargoyle is harass, its like mutalisk in sc. Hit and run, but fighting their army head on is suicide. Only works vs ud and ne.. It can work on human but they'll just tower up likemad.

Then there is the fiend build. Works vs all race, but most effective on orcs and human.

Try out ghouls/gargs or fiends/destroyers. Keep in mind to powerlevel and harass. What's so deadly about ud is hit and runs, use it!

What i found about that fiendshee thing was.. -_-; You need two things, early game advantage and number advantage. you will find that raiders with low hp escapes way too many times without frost nova. Keep in mind if u get disadvantage like loosing couple of fiends in the begging this strat will not work. This seems to work best when orc goes farseer and shadowuhnter. just that shockwave really hurts the banshees. Keep in mind smaller his and your army is stronger the magic of hero becomes and less units to cast curse. Meaning keep fighting try to keep eachother's army small.

But don't expect learning ud overnight, ud is extremly hard race to play.